Induction telegraph apparatus



(ModeL) W. LFSILVEY. INDUCTION TELEGRAPH APPARATUS.

No. 244,082. Patented July 12, 1881.

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UNITED STATES PATENT OFFICE.

WILLIAM L. SILVEY, on OASTLETON, INDIANA.

INDUCTION TELEGRAPH APPARATUS.

SPECIFICATION forming part of Letters Patent No. 244,082, dated July 12,1881.

ApplicationfiledDecember6, 1880. (Model) currents, by means of which anysignal givenon a telegraph key-instrument at any one or more places onthe line is sounded audibly by the induction-resounder to any operatoron the line; second, to provide an induction-resounder, and combine itwith an induction-coil and a telegraph-key, by means of which theinduced currents are employed for telegraphin g.

These objects I accomplish by the mechanism illustrated in theaccompanying drawings, in which the entire device is represented by asingle illustration.

Similar letters refer to similar parts throughout the several views.

A represents a table or board on which is secured an ordinary telegraphkey-instrument, O G, and an ordinary induction-coil, B. The primary wireit of the induction-coil B connects direct with the binding-screw I),and from thence to the ground through the wire k.

- The primary wire j of the induction-coil 13 conmeets with thevibrating circuit-breaker G H, and by means of the adj ustin g-screw F,bracket F, and wire t, to the anvil-post E of the keyinstrnment O. Theline-wire l is connected to the binding-screw dot the induction-coil,and the wire a is connected to the binding-screw e of the coil, also tothe binding-screw g of the resounder K.

The binding-screws e d of the induction-coil are provided with a switch,00, which connects the binding screws when messages are received, hutisdisconnected when sending messages. -When the binding-screws c and d ofthe coil are thus connected by the switch so the current of electricity,while passing through the resounder, produces a louder noise than as ifthe current passed through the coil. The switch, when connected with thepoles of the coils also acts as a lightning-arrester, and prevents thecoil from' being burned out. The

bin ding-screw b, to which the primary wire In I The resounder is formedof two parts, K K,

- and a cone-shaped sound-distributor, K united together, as shown, thedistributor K being screwed fast in the upper part, K, and the parts K Ksecured together in any ordinary manner.

The part K is provided with a circular chamber, K in its top, in whichis firmly secured a metallic disk-plate, N, with a large hole, 19, inits center. Immediately above this metallic disk N is placed a disk ofpaper, M, or other suitable material, to produce an intensified soundwhen acted upon by electricity.

The metallic button L is provided with a screw-threaded stem, 1?. Thisbutton rests on top of the disk M, and the stem 1? extends downwardthrough a central hole in the part and forms a regulator, and isadjusted by the nut R. The nut R has a groove turned in it, and theplate S is inserted in the groove formed in the nut. The plate S is madefast to the part K. Thus when the nut R is unscrewed the stem 1? andbutton L are raised off of the disk M, and whenthe nut is screwed up thebutton is drawn down onto the disk, thus increasingor diminishing thesound transmitted to the disk by the electric current.

The binding-screw post 9 is connected with the stem P of the button L atr by the wire 0.

Thus the button L is connected directly to the induction-coil B by thewire 0, binding-screw post g, wire n, and binding-screw e. Thebinding-screw post f is connected with the metallic disk N, and by meansof the wire on, binding-screw post 0, wire s, screw-post b,,and wire k,to the ground, and by the wire 74 to the battery.

pole of the coil, through the line-wire Z, to other The operation of mynew apparatus is as follows, the wires all being connected as described:When the key Got the instrument is depressed and connections made withthe anvil-block on the post E a current of electricity is set up in theprimary wiresj and k of the induction-coil, which magnetizes the core ofthe coil, causing the circuit-breaker to Vibrate, and each vibrationtoward the core breaks the circuit. The current of electricity thusinduced in the coil passes through the wire a to the stem P of theregulating-button L of the resounder, and passes through the disk M tothe metallic disk N, thence off to the ground through the wires 8 70. Asthe'charges of induced electricity pass through the disk M a veryaudible sound is produced, which is conveyed to the ear of the operatorby means of the trumpet K at the same time the charges of inducedelectricity are carried from the other stations on the line, when theinduced current passes through another resounder inlike manner and withlike results.

It is obvious that this apparatus may be used with or without acondenser.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a telegraph apparatus in which induced currents of electricityfroman induction-coil are used to produce audible sounds, the resoundercomposed of the parts K K, with trumpet K the metallic disk N, the diskM, the regulator L P, with nut 1t, and the connections n g 0, with aninduction-coil, and the connections f m and ground-wire 70',substantially as shown and described.

2. The combination, in a resounder, of the parts K K, the trumpet K themetallic disk N, thedisk M, the regulator L I, with adjusting-nut R, andthe connections 0, g, and f, substantially as shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM L. SILVEY.

Witnesses E. O. FRINK, J. B. MANsUR.

